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The Cheyenne River Lakota Sioux Indians from South Dakota are poised to sign a $400m (£286m) deal with a big Boston energy firm to build a massive wind farm across their 1m-acre reservation. It is hoped the deal will transform tribal economics nationwide and drag many Native Americans out of poverty.

The tribe has teamed up with Citizens Wind, the commercial arm of a Boston group called Citizens Energy, a not-for-profit organisation set up by congressman Joseph Kennedy, the nephew of President John F Kennedy.

Citizens Wind believes the scheme will take about three years to complete and will provide 120MW of electricity to the grid, enough to supply 50,000-60,000 average households.